[Elecraft] RF Probe again

[Gary Montalbine]

Don Wilhelm wrote:
> Gary does not work weekends, and you can likely have it isolated by then.
> 
> If you have no output from U10-4, then how about the input at pin 1? 
> That should be the BFO signal fed to the transmit mixer. (you do have 
> the KSB2 plugged in correctly do you not?).

Pin 1 also reads 0. Per the troubleshooting instructions the KSB2 was 
removed. I installed temporary jumper pins between 1 & 3 of J9 and J10 
and installed a .001mf cap between pins 7 & 12 of J11. I can reinstall 
KSB2 if you think it will help.

   The only other signal that
> must be present is the TX VFO which should have at least 70 mV RF on U10 
> pin 6.

I have .16V

   You must be in TUNE or otherwise keydown to get RF to U10-1.

Tried both.
> 
> If you have RF at both U10-1 and U10-6, you shoudl also have RF at 
> U10-4.  Check the DC voltage at pin 8 (it will only be present during 
> TUNE or other transmit periods).

Pin 8 voltage is 6V in tune.

Thanks,

Gary WA4SZI
> 
> 73,
> Don W3FPR
> 
> Gary Montalbine wrote:
>> Basic problem was engage mind before typing. High DC voltage at U8 and 
>> no RF voltage at pin 4 of U10. Low RF voltage at pin 6 of U9. Wanted 
>> to make sure my RF probe was good before continuing. It has been many 
>> years since I have messed with electronic circuits.I may be back at 
>> the Novice level. Would this be the appropriate forum to address my 
>> transmitting problems or should I bother Gary?
>>
>> I appreciate everybodys help thus far.
>>
>> Gary, WA4SZI
>>
>> K2 #1009